Organic light emitting display devices and methods of manufacturing organic light emitting display devices

Abstract

An organic light emitting display device may include a first substrate, a first electrode disposed on the first substrate, a pixel defining layer disposed on the first electrode and the first substrate, an organic light emitting structure disposed on the first electrode, a second electrode disposed on the organic light emitting structure and the pixel defining layer, a second substrate disposed on the second electrode, etc. The pixel defining layer may include a fine uneven structure positioned in the display and the non-display regions. The organic light emitting structure may be substantially uniformly formed on the first electrode through the pixel defining layer having the fine uneven structure, so that an organic light emitting display device may exhibit increased lifetime and may show improved image quality.

What is claimed is: 
     
       1. An organic light emitting display device, comprising:
 a first substrate; 
 a first electrode disposed on the first substrate; 
 a pixel defining layer disposed on the first electrode and the first substrate to define a display region and a non-display region, the pixel defining layer including an opening exposing the first electrode in the display region, the pixel defining layer including a fine uneven structure positioned in the display and the non-display regions, the fine uneven structure comprising pathways for exhaustion of gases from within the opening; 
 an organic light emitting structure disposed on the first electrode; 
 a second electrode disposed on the organic light emitting structure and the pixel defining layer; and 
 a second substrate disposed on the second electrode. 
 
     
     
       2. The organic light emitting display device of  claim 1 , each of the first electrode and the second electrode including one of a material having a reflectivity and a material having a transmittance. 
     
     
       3. The organic light emitting display device of  claim 2 , the first electrode including at least one selected from aluminum (Al), silver (Ag), platinum (Pt), gold (Au), chromium (Cr), tungsten (W), molybdenum (Mo), titanium (Ti), palladium (Pd), iridium (Ir) and an alloy thereof, and the second electrode including one selected from indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium oxide (IGO), zinc oxide (ZnOx), gallium oxide (GaOx) and tin oxide (SnOx). 
     
     
       4. The organic light emitting display device of  claim 2 , the first electrode including one selected from indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium oxide (IGO), zinc oxide (ZnOx), gallium oxide (GaOx) and tin oxide (SnOx), and the second electrode including at least one selected from aluminum (Al), silver (Ag), platinum (Pt), gold (Au), chromium (Cr), tungsten (W), molybdenum (Mo), titanium (Ti), palladium (Pd), iridium (Ir) and an alloy thereof. 
     
     
       5. The organic light emitting display device of  claim 1 , the fine uneven structure being positioned on a sidewall of the opening and on the pixel defining layer in the non-display region. 
     
     
       6. The organic light emitting display device of  claim 5 , the fine uneven structure including one of a plurality of trenches and a plurality of grooves, the one of a plurality of trenches and a plurality of grooves being arranged in a predetermined direction. 
     
     
       7. The organic light emitting display device of  claim 5 , the fine uneven structure including one of a plurality of trenches, a plurality of grooves and a plurality of dents, the one of a plurality of trenches, a plurality of grooves and a plurality of dents being arranged in a plurality of directions. 
     
     
       8. The organic light emitting display device of  claim 7 , one of the trenches, the grooves and the dents being partly or entirely communicated with one another. 
     
     
       9. The organic light emitting display device of  claim 5 , the pixel defining layer including one of an organic material and an inorganic material. 
     
     
       10. The organic light emitting display device of  claim 9 , the pixel defining layer comprising one of benzocyclobutene (BCB), photoresist, phenol-based resin, polyacryl-based resin, polyimid-based resin, acryl-based resin, silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy) and silicon oxycarbide (SiOxCy). 
     
     
       11. A method of manufacturing an organic light emitting display device, comprising:
 providing a first substrate; 
 forming a first electrode on the first substrate; 
 forming a pixel defining layer on the first electrode and the first substrate, the pixel defining layer defining a display region and a non-display region; 
 forming an opening exposing the first electrode in the display region by partially etching the pixel defining layer; 
 forming a fine uneven structure within the pixel defining layer, the fine uneven structure being disposed in the display and the non-display regions, the fine uneven structure comprising pathways for exhaustion of gases from within the opening; 
 forming an organic light emitting structure on the first electrode; 
 forming a second electrode on the organic light emitting structure and the pixel defining layer; and 
 forming a second substrate on the second electrode. 
 
     
     
       12. The method of  claim 11 , further comprising forming an underlying structure having a switching device and an insulation layer between the first substrate and the first electrode. 
     
     
       13. The method of  claim 11 , the step of forming an opening further comprising using an etchant in a wet etching process conducted at a temperature below about 200° C. 
     
     
       14. The method of  claim 11 , the fine uneven structure being formed on a sidewall of the opening and on the pixel defining layer in the non-display region. 
     
     
       15. The method of  claim 11 , the step of forming the fine uneven structure comprising contacting a roller having bristles arranged in a predetermined direction with the pixel defining layer while moving the first substrate. 
     
     
       16. The method of  claim 11 , the step of forming the fine uneven structure comprising irradiating a laser onto the pixel defining layer using a mask having micro holes arranged in a predetermined direction while moving the first substrate. 
     
     
       17. The method of  claim 11 , the step of forming the fine uneven structure further comprising:
 contacting a roller having bristles arranged in a predetermined direction with the pixel defining layer while moving the first substrate in a first direction; and 
 contacting the roller with the pixel defining layer while moving the first substrate in a second direction different from the first direction. 
 
     
     
       18. The method of  claim 11 , the step of forming the fine uneven structure further comprising:
 irradiating a laser onto the pixel defining layer using a mask having micro holes arranged in a predetermined direction while moving the first substrate in a first direction; and 
 irradiating a laser onto the pixel defining layer using the mask while moving the first substrate in a second direction different from the first direction. 
 
     
     
       19. The method of  claim 11 , the organic light emitting structure being formed by a laser induced thermal imaging process using a donor substrate having an organic transfer layer. 
     
     
       20. The method of  claim 19 , at least one of air and a gas in the opening of the pixel defining layer being exhausted through the fine uneven structure in the laser induced thermal imaging process.